Organic light-emitting display device and driving method thereof

Abstract

An organic light-emitting display device includes: a display panel; a deterioration threshold value calculator for calculating a deterioration threshold value from values of accumulated image data respectively input to the plurality of pixels; a current sensor for detecting a current amount flowing through pixels in one of first to nth display areas of the display panel in a power-off section of the display panel; and a deterioration amount calculator for defining a deterioration area including a group of pixels from among the pixels each having a value of image data that is equal to or greater than the deterioration threshold value among pixels in the first to nth display areas, and calculating a deterioration amount of the pixels in the deterioration area, wherein the current sensor is configured to detect a current amount flowing through pixels in one of the first to nth display areas in each power-off section.

What is claimed is: 
     
       1. An organic light-emitting display device comprising:
 a display panel comprising a plurality of pixels, wherein each of the plurality of pixels comprises an organic light-emitting device configured to emit one of a plurality of colors comprising red, green, and blue; 
 a deterioration threshold value calculator configured to:
 store, as accumulated image data for each of the pixels, information regarding image data supplied to the pixels; and 
 calculate a deterioration threshold value based on an average of values of the accumulated image data respectively input to the plurality of pixels; 
 
 a current sensor configured to detect a current amount flowing through pixels in one of first to nth display areas of the display panel in a power-off section of the display panel; and 
 a deterioration amount calculator configured to define a deterioration area comprising a group of pixels from among the plurality of pixels each having a value of the corresponding accumulated image data that is equal to or greater than the deterioration threshold value among pixels in the first to nth display areas, and to calculate a deterioration amount of the pixels in the deterioration area, 
 wherein the current sensor is configured to detect a current amount flowing through pixels in one of the first to nth display areas in each power-off section of the display panel. 
 
     
     
       2. The organic light-emitting display device of  claim 1 , wherein the deterioration threshold value calculator comprises a memory that stores values of accumulated pieces of image data respectively input to the plurality of pixels in the display panel, and is configured to calculate a deterioration threshold value from the values of the accumulated pieces of image data stored in the memory. 
     
     
       3. The organic light-emitting display device of  claim 1 , wherein the deterioration threshold value is defined by an average of values of accumulated pieces of image data respectively input to the plurality of pixels. 
     
     
       4. The organic light-emitting display device of  claim 1 , wherein the current sensor sequentially senses the first to nth display areas. 
     
     
       5. The organic light-emitting display device of  claim 1 , wherein the deterioration amount calculator is configured to calculate a background current from current amounts detected from the plurality of pixels in the display panel. 
     
     
       6. The organic light-emitting display device of  claim 5 , wherein the deterioration amount calculator is configured to calculate a deterioration amount based on a difference between a current amount detected from pixels in the deterioration area and the background current. 
     
     
       7. The organic light-emitting display device of  claim 1 , wherein the current sensor is configured to detect a current amount flowing through pixels in one of the first to nth display areas after a predetermined time period has passed. 
     
     
       8. The organic light-emitting display device of  claim 1 , wherein the current sensor comprises a detection circuit configured to apply a predetermined voltage to the plurality of pixels in a power-off section of the display panel, and to detect a current amount flowing through the organic light-emitting device of the plurality of pixels according to the applied voltage. 
     
     
       9. The organic light-emitting display device of  claim 1 , further comprising a deterioration compensator configured to provides a pixel in the deterioration area with deterioration compensation data. 
     
     
       10. A method of driving an organic light-emitting display device, wherein the organic light-emitting display device comprises a display panel comprising a plurality of pixels, wherein each of the plurality of pixels comprises an organic light-emitting device that emits one of a plurality of colors comprising red, green, and blue, the method comprising:
 storing, as accumulated image data for each of the pixels, information regarding image data respectively input to the plurality of pixels; 
 calculating a deterioration threshold value based on an average of values of the accumulated image data; 
 detecting a current amount flowing through pixels in one of first to nth display areas of the display panel in a power-off section of the display panel; and 
 defining a deterioration area formed of a group of pixels from among the plurality of pixels each having a value of the corresponding accumulated image data that is equal to or greater than the deterioration threshold value among the pixels in the first to nth display areas; 
 calculating a deterioration amount of the pixels in the deterioration area; and 
 determining a compensation amount corresponding to the deterioration amount. 
 
     
     
       11. The method of  claim 10 , wherein the deterioration threshold value is defined by an average of the values of the image data. 
     
     
       12. The method of  claim 10 , wherein in the detecting of a current amount, the first to nth display areas are sequentially sensed. 
     
     
       13. The method of  claim 10 , wherein in the calculating of a deterioration amount, a background current is calculated from current amounts detected from the plurality of pixels in the display panel. 
     
     
       14. The method of  claim 13 , wherein in the calculating of a deterioration amount, a deterioration amount is calculated based on a difference between a current amount detected from the pixels in the deterioration area and the background current. 
     
     
       15. The method of  claim 10 , wherein in the detecting of a current amount, a current amount flowing through pixels in one of the first to nth display areas after a predetermined time period has passed after a power-off of the display panel is detected.